This problem has been fixed.
This topics relates to a NullPointerException while using the item types wizards in the case where there has been a configuration with not one item defined uploaded via "Click to Manage Item Types and View Definitions" in Universal Worklist - >Administration view.
The affected wizards by this behavior are:
Define custom attributes and customize the corresponding view;
Define and configure what you want to launch when an item is clicked;
Customize attributes and define what you want to launch when an item is clicked (both of the above options).